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Almost all modern car engines use a water cooling system to maintain warmer temperatures. So, the water become "blood" which channels the heat from generating sources to the final disposal.

The problem, no air bubbles appear in the path of cooling water. Can disrupt the air entering the pressure in the system and ultimately disrupt the engine cooling water task. Greater risk because of overheated engines among component position in the cars is now more tightly.
Air can enter the radiator cap when opened and closed. That air exists between surface water and radiator cap. In addition, air may also exist because the radiator cap condition was not good.

At the radiator cap there is a functioning valve airflow from the reservoir tank when the heat and sucking water from the reservoir to the radiator (when cold).

How to expel the trapped air? Follow the steps below

1. Make sure the temperature of the engine in cold conditions.
2. Open the radiator cap. Turn on the machine (so the water circulates). After that, enter the water to the mouth of the radiator, and stop if it is full.
3. Cover again with a perfect radiator.
4. After that, unscrew the air dump. Waster closed position every different car brands. The location can be seen in the vehicle owner manuals.
5. Notice the water coming out of the valve. If there is scum, then it indicates there is still air in the cooling channels. That means you have to keep doing this process until that comes out is water without foam.
6. Check the amount of water in the tube reservoir reserves. If not, add up to the limit.